酸,碱两步催化合成聚钛硅氧烷铝基材涂膜的研究

聚钛硅氧烷底涂液是用Ｎ－［３－（三乙氧基硅烷］－４，５二羟咪唑和钛烷氧化物在甲醇、水溶液中以酸和碱两步催化水解、缩聚而成，该底涂液涂复在铝基材上经热解，脱碳化物转化成准无机耐蚀涂膜，下述因素对涂膜的耐蚀性起到了重要作用：（１）涂膜的厚热解温度；（２）膜与基材之间的界面结合；（３）介质对涂膜的润湿性。     

ABS/镁盐晶须复合材料的研究

以（乙烯／乙酸乙烯酯／苯乙烯）三元共聚物（BS树脂）为增容荆，采用双螺杆挤出机制备了（丙烯腈／丁二烯／苯乙烯）共聚物（ABs）／镁盐晶须复合材料，研究了BS树脂、镁盐晶须用量对复合材料力学性能、流动性能的影响、结果表明，加入BS树脂有利于提高复合材料的拉伸强度和冲击强度，复合材料的熔体流动速率（MFR）随BS树脂用量增加而增大，且其MFR对温度或负荷呈非线性函数关系，比ABS对负荷更为敏感．     

纳米二氧化硅增强、增韧聚丙烯的研究

研究了纳米二氧化硅改性聚丙烯体系的热处理前后力学性能和加入交联剂、弹性体对该体系的影响。结果表明，纳米SiO2添加量在2％左右时，可提高聚丙烯的拉伸强度10％、拉伸弹性模量30％、冲击强度80％。聚丙烯经140℃热处理并加入2.0％～2．4％的DVB交联剂和二次挤出加工，可以进一步提高该体系的拉伸强度和冲击强度。     

Characterization of Ceramic Foam Filters Used for Liquid Metal Filtration

In the current study, the morphology including tortuosity, and the permeability of 50-mm thick commercially available 30, 40, 50, and 80 pores per inch (PPI) alumina ceramic foam filters (CFFs) have been investigated. Measurements have been taken of cell (pore), window, and strut sizes, porosity, tortuosity, and liquid permeability. Water velocities from ~0.015 to 0.77 m/s have been used to derive both first-order (Darcy) and second-order (Non-Darcy) terms for being used with the Forchheimer equation. Measurements were made using 49-mm “straight through” and 101-mm diameter “expanding flow field” designs. Results from the two designs are compared with calculations made using COMSOL 4.2a^® 2D axial symmetric finite element modeling (FEM), as a function of velocity and filter PPI. Permeability results are correlated using directly measurable parameters and compared with the previously published results. Development of improved wall sealing (49 mm) and elimination of wall effects (101 mm) have led to a high level of agreement between experimental, analytic, and FEM methods (±0 to 7 pct on predicted pressure drop) for both types of experiments. Tortuosity has been determined by two inductive methods, one using cold-solidified samples at 60 kHz and the other using liquid metal at 50 Hz, giving comparable results.     

聚氨酯浇注弹性体的合成研究

采用2种不同的预聚体合成方法制备聚氨酯浇注弹性体,并对其性能进行了测试。结果表明,分步加入扩链剂乙二醇的预聚体合成工艺所得浇注聚氨酯弹性体的拉伸强度比一次性加入乙二醇的预聚体合成工艺所得浇注聚氨酯弹性体的拉伸强度提高了70%左右,而伸长率变化不大。同时研究了这2种制备工艺对材料动态力学性能的影响。并探讨了不同R值及配方中交联剂用量对聚氨酯浇注弹性体力学性能的影响。     

软土边壁(坡)流鼓破坏模式研究

依据相似模型原理及所建立的相似法则,对软土边壁（坡）破坏模式进行了实验研究。试验研究证实,刚体转动假设不适用于软土边壁（坡）稳定性分析;软土地壁（坡）不取圆弧破坏模式,而是取流鼓破坏模式。模型实验结果与现场试验及理论分析计算结果规律基本和,数据较为吻合。     

The performance of SAS-super-180 air sampler and settle plates for assessing viable fungal particles in the air of dry-cured meat production facility

Performances of SAS-super-180 air sampler and settle plates were investigated for the assessment of airborne fungal food contamination. Air samples were taken from processing rooms of a dry-cured production facility and outdoors. Fungal colonies and numbers of species were counted and compared. Quantitatively, the air sampler showed higher numbers of species and mean CFU/plate compared to settle plates. Qualitatively, the two methods showed similar dominating fungal genera and species associated with dry-cured meat products. The study showed settle plates could provide important qualitative information for food processing plants where airborne fungi associated with food products are the targets.     

一种新颖的软件设计方法及其实现

可编程控制器(PC)在工业控制中的应用越来越广泛。在我国,应用PC及其上位机实现洗煤厂全部设备的分布式控制还是第一次。本文提出了一些新颖的程序设计方法,它具有简洁、高效、灵活的特点。该方法的运用节省了计算机资源,改善了系统性能。